Physicians often face discouragement when patients repeatedly return to self-indulgent habits after being restored to health.

Original passage

However skilled and faithful a physician may be, there is in his experience much of apparent discouragement and defeat. Often his work fails of accomplishing that which he longs to see accomplished. Though health is restored to his patients, it may be no real benefit to them or to the world. Many recover health, only to repeat the indulgences that invited disease. With the same eagerness as before, they plunge again into the round of self-indulgence and folly. The physician's work for them seems like effort thrown away.